<template>
  <transition name="slide">
    <div class="user-center">
      <div class="back" @click="$router.back()">
        <i class="icon-back"></i>
      </div>
      <div class="switches-wrapper">
        <switches @switch="switchItem" :switches="switches" :currentIndex="currentIndex"></switches>
      </div>
      <div ref="playBtn" class="play-btn" @click="random">
        <i class="icon-play"></i>
        <span class="text">随机播放全部</span>
      </div>
      <div class="list-wrapper" ref="listWrapper">
        <scroll
          ref="favoriteList"
          class="list-scroll"
          v-if="currentIndex === 0"
          :data="favoriteList"
          :bounceTop="false"
        >
          <div class="list-inner">
            <song-list :songs="favoriteList" @select="selectSong"></song-list>
          </div>
        </scroll>
        <scroll ref="playList" class="list-scroll" v-if="currentIndex === 1" :data="playHistory">
          <div class="list-inner">
            <song-list :songs="playHistory" @select="selectSong"></song-list>
          </div>
        </scroll>
      </div>
      <div class="no-result-wrapper" v-show="noResult">
        <no-result :title="noResultDesc"></no-result>
      </div>
    </div>
  </transition>
</template>

<script>
import Switches from 'components/switches/switches';
import Scroll from 'components/scroll/scroll';
import SongList from 'components/song-list/song-list';
import NoResult from 'components/no-result/no-result';
import Song from 'common/js/song';
import { mapGetters, mapActions } from 'vuex';
import { playlistMixin } from 'common/js/mixin';

export default {
  components: { Switches, Scroll, SongList, NoResult },
  mixins: [playlistMixin],
  data() {
    return {
      currentIndex: 1,
      switches: [{ name: '我喜欢的' }, { name: '最近听的' }],
    };
  },
  computed: {
    noResult() {
      if (this.currentIndex === 0) {
        return !this.favoriteList.length;
      } else {
        return !this.playHistory.length;
      }
    },
    noResultDesc() {
      if (this.currentIndex === 0) {
        return '暂无收藏歌曲';
      } else {
        return '你还没有听过歌曲';
      }
    },
    ...mapGetters(['favoriteList', 'playHistory']),
  },
  methods: {
    handlePlaylist(playlist) {
      const bottom = playlist.length > 0 ? '60px' : '';
      this.$refs.listWrapper.style.bottom = bottom;
      this.$refs.favoriteList && this.$refs.favoriteList.refresh();
      this.$refs.playList && this.$refs.playList.refresh();
    },
    switchItem(index) {
      this.currentIndex = index;
    },
    selectSong(song) {
      this.insertSong(new Song(song));
    },
    random() {
      let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory;
      if (list.length === 0) {
        return;
      }
      list = list.map((song) => {
        return new Song(song);
      });
      this.randomPlay(list);
    },
    ...mapActions(['insertSong', 'randomPlay']),
  },
};
</script>

<style scoped lang="stylus">
@import "~common/stylus/variable"

.user-center
  position: fixed
  top: 0
  bottom: 0
  z-index: 100
  width: 100%
  background: $color-background
  &.slide-enter-active, &.slide-leave-active
    transition: all 0.3s
  &.slide-enter, &.slide-leave-to
    transform: translate3d(100%, 0, 0)
  .back
    position absolute
    top: 0
    left: 6px
    z-index: 50
    .icon-back
      display: block
      padding: 10px
      font-size: $font-size-large-x
      color: $color-theme
  .switches-wrapper
    margin: 10px 0 30px 0
  .play-btn
    box-sizing: border-box
    width: 135px
    padding: 7px 0
    margin: 0 auto
    text-align: center
    border: 1px solid  $color-text-l
    color: $color-text-l
    border-radius: 100px
    font-size: 0
    .icon-play
      display: inline-block
      vertical-align: middle
      margin-right: 6px
      font-size: $font-size-medium-x
    .text
      display: inline-block
      vertical-align: middle
      font-size: $font-size-small
  .list-wrapper
    position: absolute
    top: 110px
    bottom: 0
    width: 100%
    .list-scroll
      height: 100%
      overflow: hidden
      .list-inner
        padding: 20px 30px
  .no-result-wrapper
    position: absolute
    width: 100%
    top: 50%
    transform: translateY(-50%)
</style>
